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发表于 2011-6-14 10:53:13
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Standard-State Enthalpy of Reaction (H)
Three factors can affect the enthalpy of reaction:
1、The concentrations of the reactants and the products
2、The temperature of the system
3、The partial pressures of the gases involved (if any)
The effects of changes in these factors can be shown relative to the standard-state enthalpy of reaction (H) which is the change in the enthalpy during a chemical reaction that begins and ends under standard-state conditions.
Standard-state conditions:
The partial pressures of any gases involved in the reaction is 0.1 MPa.
The concentrations of all aqueous solutions are 1 M.
Measurements are also generally taken at a temperature of 25C (298 K) |
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